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Sterol regulatory element-binding protein 1 (SREBP-1), a member of the basic-helix-loop-helix-leucine zipper (bHLH-ZIP) family of transcription factors, is synthesized as a 125 kd precursor that is attached to the nuclear envelope and endoplasmic reticulum. In sterol-depleted cells, the membrane-bound precursor is cleaved to generate a soluble NH2-terminal fragment (apparent molecular mass, 68 kd) that translocates to the nucleus.

This element is a decamer flanking the LDL receptor gene and other genes involved in, for instance, sterol biosynthesis. The protein is synthesized as a precursor that is attached to the nuclear membrane and endoplasmic reticulum. Following cleavage, the mature protein translocates to the nucleus and activates transcription by binding to the SRE1. Sterols inhibit the cleavage of the precursor, and the mature nuclear form is rapidly catabolized, thereby reducing transcription. The protein is a member of the basic helix-loop-helix-leucine zipper.

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